is the teacher at the board? ответ

Is the teacher at the board? — Yes, the teacher is at the board.Yes, he is.No, the teacher is not at the board, the teacher is at the table.No, he is not.Is the pupil at the table? — Yes, the pupil is at the table.Yes, he is.No, the pupil is not at the table, he is at the blackboard.No, he is not.